Asp TextBox conflicting with Kendo Window

[Eric]

Hi. I am having a little problem with kendo window, hope you guys can help me out.

I am developing an ASP.NET Web Forms application where i use some kendo controls with asp.net server controls. 
In this application I have a page where the user clicks in a button which will open a kendo window. This kendo window has an asp:TextBox (which will turn into a kendo datetimepicker) and a Save button. 

The problem is: when this textbox is inside the kendo window, it arrives on server side code without value.
When i comment the kendo window initialization code, everything works out just fine. 

Does the kendo window create another form or something?

My codes:

Window and textbox:

<div id="newSessionWindow">

 

<label for="sessionDate">Data da próxima sessão*</label><br />

<asp:TextBox runat="server" ID="sessionDate" ClientIDMode="Static"></asp:TextBox>

             

<br /><br />   

             

<asp:LinkButton runat="server" ID="SaveSession" Text="Salvar" CssClass="k-button" />

 

</div>

Initializing kendo window and kendo datetimepicker

// New Session Window

                 $("#newSessionWindow").kendoWindow({

                     draggable: true,

                     appendTo: "#globalBody",

                     height: "110px",

                     modal: true,

                     resizable: false,

                     title: "Nova sessão",

                     width: "400px"

                 });

 

                 $("#sessionDate").kendoDateTimePicker({

                     format: "dd/MM/yyyy hh:mm tt",

                     start: "month",

                     depth: "month",

                     min: new Date(year, month, day)

                 });

Handling the click event of the button who opens the kendo window:

$("#AddSession").click(function (e) {

 $("#newSessionWindow").show();

                      

 var newSession = $("#newSessionWindow").data("kendoWindow");

 newSession.center();

 newSession.open();

});

Best Regards!